Thanks for your reply, I'm thinking that by that time (1905) emigration might have been organized, probably by the JCA or Baron Hirsch, as thousands of families came from Besarabia to Argentina. So travel routes to get to Hamburg might have been well prepared. Perhaps there are old archives with that information, plans, etc.
Ship or train.
Another way is to ask people living in Izmail if there was ship traffic by the Danube and since when

Ricardo Rubinstein